Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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A Study on the Site Selection Method for the Creation of a Flood Buffer Section Considering the Nature-based Solution - Case Study from Upstream of Daecheong Dam to Downstream of Yongdam Dam

자연성기반기술의 홍수완충구간 조성을 위한 입지 선정 방법에 관한 연구 - 대청댐 상류부터 용담댐 하류구간 사례 연구

  • Ji, Un (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jang, Eun-kyung (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Bae, Inhyeok (Department of Civil and Environmental Engineering, University of Science and Technology) ;
  • Ahn, Myeonghui (Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Bae, Jun (Water Resources Department, Isan Corporation)
  • 지운 (한국건설기술연구원 수자원하천연구본부) ;
  • 장은경 (한국건설기술연구원 수자원하천연구본부) ;
  • 배인혁 (과학기술연합대학원대학교 건설환경공학) ;
  • 안명희 (한국건설기술연구원 수자원하천연구본부) ;
  • 배준 ((주)이산 수자원부)
  • Received : 2022.08.22
  • Accepted : 2022.09.13
  • Published : 2022.09.30
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Abstract

The magnitude and frequency of extreme floods are increasing owing to the effects of climate change. Therefore, multipurpose flood management techniques incorporating nature-based solutions have been introduced to mitigate the limitations of flood management and river design methods relying on existing observation data. Nature-based solutions to prepare for such extreme flooding events include ways to retreat the embankment, expand the floodplain, and reduce flood damage. To apply these technologies, adopting appropriate location selection methods based on various evaluation factors, such as flood damage reduction effects, sustainable ecological environments, river connectivity, and physical channel structure enhancements, should be prioritized. Therefore, in this study, the optimal location for implementing the multipurpose floodplain construction project was determined by selecting the location of the floodplain expansion with objectivity in the river waterfront area upstream of Daecheong Dam to downstream of Yongdam Dam. Through the final location determination, the Dongdaeje and Jeogokje sections were included in the optimal location considering both flood damage reduction and water environment improvement.

기후변화의 영향으로 최근 하천에서 극한 홍수 발생 크기와 빈도가 증가하고 있으며, 따라서 기존의 관측 기록에 의존한 홍수관리 및 하천설계 방식의 한계를 개선하기 위해 자연성 기반의 기술을 접목한 다목적 홍수 관리 기법이 도입되는 추세이다. 이러한 극한 홍수에 대비하기 위한 자연성 기반 해법 중에는 제방을 후퇴하여 홍수터를 확장하고 극한 홍수 발생시에 홍수피해를 저감 시키는 방법이 있다. 이러한 기술을 적용하기 위해서는 홍수피해 저감 효과, 지속가능한 생태환경, 하천 연결성 및 하도의 물리적 구조 개선 등의 다양한 평가항목에 기초한 적합한 입지 선정 방법을 채택하는 것이 우선되어야 한다. 따라서 본 연구에서는 대청댐 상류부터 용담댐 하류 지역내 하천 수변구역을 대상으로 객관성이 확보된 입지 선정 방법을 적용하여 다기능 홍수터 조성 사업을 위한 후보지의 적정성을 판단하였다. 최종 입지 판정 결과, 홍수피해 저감과 수환경 개선을 모두 고려한 최적의 입지 우선순위에 동대제 구간과 저곡제 구간이 포함되는 것으로 나타났다.

Keywords

Acknowledgement

본 논문은 금강수계관리위원회의 2021년 금강수계환경기초조사사업인 『대청댐 수환경 개선을 위한 홍수터 기초조사 연구』에서 수행된 내용과 자료를 기반으로 작성되었으며, 본 연구는 환경부의 재원으로 한국환경산업기술원의 기후변화대응환경기술개발사업의 지원을 받아 수행되었습니다 (2022003460002).

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